Dipper-door.



Witnesses F. W. THOMSON.

DIPPEB DOOR. APPLICATION FILED JULY 6, 1910.

986,525& Patented Mar. 14, 1911.

flK/z/zZZ%ZdWZ M/ z r Attorneys FREDERICKWILLIAM THOMSON, OF FORT WILLIAM, ONTARIO, CANADA.

DIPPER-DOOR.

Specification of Letters Patent.

Patented Mar. 14, 1911.

Application filed July 6, 1910.. Serial-No. 570,649.

10 when, employed for ,dredging or submarine purposes and 1t consists in the novel ar-' rangement and configuration of its parts as hereinafter describe At the present time it is a common prac- 1 tice to use a plane or fiat door upon a dipper when the same is employed for dredging purposes and it not infrequently happens that the door closes against the bottom of a dipper at. the same time that the door strikes the surface of the water and frequently the incident shock without the possibility of rebound causes the door to break and go to pieces and at other times the shock is suflicient to bend or warp the door so that it does not properly fit against the adjacent parts of the dipper.

g It is the object of the present invention to eliminate this objectionable feature in a great measure and this is done by providing a door of peculiar configuration especially adapted to enter the water by spreading the same rather than pushing a volume of water bodily away from the dipper as it is lowered. With the above object in view the dipper,

door is provided with a convex bottom side and a concave top side and'is further pro vided with an impressed groove through which the latch bolt may move.

In the accompanying drawin'gs,'Figure 1 isa side elevation of a dipper with the dipper door shown in section. Fig. 2 is a bottom'plan view of the dipper door. Fig.

3-is a rear edge elevation of the dipper door.

As. shown 1n the accompanying drawing, the door lis formed of material which is approximately of the same transverse thick ness throughout and the said door I is stamped orfiotherwi'se formed with a convex free edge and extends from a point approxil inately at the middle. 0f the door as the edge 1 thereof. A guide? is located in the vicinity of the free-'-'edge-' ofthef door land a latch bottom side and. a concave top side." upwardl disposed.. ch anne1 .or'groove 2 1s.

'sameand having .a convex lower side. formed 1n the door J 'in the vicinity of its bolt 4 passes through the said guide and also traverses the length of the groove 2 and the 1111181" portion of the said latch bolt passes through a guide 5 providedupon the door '1 in the vicinity of the hinged edgethereof.

A recess 6 is formed in the door 1 above the guide 3 and friction: rollers or elements 7 are located in the said recess 6 and bear against the upper edge of" the latch 'bolt 4. A roller 8 is journaled in the guide 5 and supports the inner end portion'of the said, latch bolt 4. Any suitable means may be provided for moving the latch bolt 4 longitudin'all'y and a dipper is provided in the vicinity of its lower edge with a keeper 9 adapted to receive the end portion of .the said latch bolt in the usual manner. From the above description it will be seen that when the door 1 is closed at its edges against the bottom ofthe dipper, the dipper as an entity is provided'with a rounded end and consequently should the .dipperbe lowered into the water and strike the surface of the same, the water will be spreader forced laterally away from the sides of the dipper and there will be slight-tendency to force a volume of water in the same-'dlrection in which the dipper. is moving. Therefore thecon figuration of the door serves as means for parting the water to permit the entrance of the dipper and consequently unnecessary'impact is avoided. Furthermore asthe dipper approaches the bottom the lower portion of thelatch bolt ,4 is protected by the sides of the groove 2 and should the bottom come in contact with rock or earth, the said latchv bolt is protected to such an extent as to preclude the possibility of bending the same out of shape to prevent its operation. Furthermore the peculiar configuration of the door braces the door structure against all strains towhich it will be subjectedanddn crease the carrying capacity of the dipper.

, Having described the invention what I claim as new and desire to secure by Letters Patent is i 1. In 0. Inbination with a dipper a door hingedly attached thereto. and; adapted to elose at its edges against the end of'the 2. In,combination 'with a'dipp'er, a doorhingedly attached thereto-and adapted to close at its edges against the end. of the same and" having a convex lower side provided with a groove extending approximately I said door having a convexed lower side profrom the middle of the door to its free edge, and a latch bolt slidably mounted in said groove.

3. In combination with a dipper a door hingedly attached thereto and adapted to close at its edges-against the end of the same,-

vided with a groove extending from a po nt approximately at the middle of the door to the free edge thereof, a latch bolt arranged to move along said groove, guides provided I at the opposite edge portions of the door for the latch bolt and anti-friction devices 10- eated at the guides and adapted to bear against the edges of the latch bolt.

In testimony that I claim the foregoing as my own, I have hereto-aflixed my signature in the presence of two witnesses.

FREDERICK WILLIAM THOMSON- I Witnesses:

E,'R. WILSON, H. WILsorI RENNIE. 

